Why won't the touch on my screen work?

my phone was working perfectly this morning, but it wasn't charged so i plugged it into the charger. i went to get in the car for work and tried to swype the screen to turn on my bluetooth & it hasn't let me swype since then. I have rebooted & taken the battery out for 30 minutes and put it back in. & i just got this phone a few months ago.! please help!